MBR partitions have a 1-byte "type" code, which is too small to be useful (most operating systems use very generic type codes and just guess the rest). The most common scheme for this is an Extended Boot Record, though BSD systems often nest a BSD disklabel instead.ĪPM can grow up to 62 partitions GPT can have at least 128. To get around the limit, one of the partitions is usually created as an "extended partition" which nestedly contains a series of "logical partitions". MBR and APM limit the usable disk size to 2 TiB (a partition can neither start nor end beyond the 2 TiB limit). Differences between MS-DOS style Master Boot Record (MBR), the Apple Partition Map (APM), and the UEFI-style GUID Partition Table (GPT) are such: Disk size
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